Cooling system for dynamo-electric machines



G. M. EATON.

coouwc SYSTEM FOR DYNAMO ELECTRIC MACHINES.

APPLICATION FILED MAR. 14. 1917.

l Patented Jan. 11, 1921.

WITNESSES:

INVENTOR George M. Ea for? ATTORNEY in connection with dynamo-electric ma cairn!) STATES PATENT OFFICE.

GEORGE M. nAToN, or PITTSBURGH, PENNSYLVANIA, \ASSIGNOR TO wEs'rINGnoUsi; ELECTRIC & MANUFACTURING COMPANY, A conronArroN or PENNSYLVANIA." I

COOLING SYSTEM FOR DYNAMO-ELECTRIC MACHINES.

Specification of Letters Patent. PatentedJan, 1, 1921;

Application filed March 14, 1917. Serial No. 154,902.

T 0 all w/wmtt may concern):

Be it known that I, Gnonen M. EATON, a citizen of the United States,.and a resident of Pittsburgh, inthe county of Allegheny andState of Pennsylvania, have invented a new and useful Improvement in Cooling Systems for Dynamo-Electric Machines, of which the following is a specification.

My invention relates toventilating apparatus, particularly of thetype that is used chines, and it has for its object to provide means for substantially eliminating foreign matter, such as snow and dirt, from the ventilating air that is: delivered to. such nachines.

It is well known'that the proper ventilationof electric driving motors andof auXil-.

iary apparatus for railway vehicles is animportant factor in the operation thereof and, as the electrical. apparatus is usually placed beneath the floor of, thevehicle, there is a great tendency for. dust and moisture to enter into the ventilating system. that may be employed in connection therewith. This tendency is particularly pronounced on electrified divisions .of main-line railroads on which the high train speeds'and open rightof-way. result iii the; production .ofmuch dust and in particularly bad snow conditions. As the various forms oflbafiies and screens usually embodied in self ventilated apparatus have been. found unsatisfactory, under the above described conditions,,lpropose to free the air of'foreign matter'before it is delivered to the machinesby providing a,combined'ejector and centrifugal separating device in the intake passage to the blower.

hr the accompanying; drawings, higure 1 is a plan view showing the arrangement of the electrical apparatus beneath the floor of a railway vehicle; Fig. 2 is a side elevation of the apparatus shown in Fig. 1, and Fig. 3 is an enlarged sectional view along the line TIL-I11 of Fig.1, showing the details of my invention.

The outlines of the floor of a railway vehicle are shown by the broken lines inFig. 1. A truck is pivotally related to the floor and electric motors 2 are suitably geared to the driving wheels 3 of the truck 1. A trans former 4, for supplying power to the motors 2, 'is suitably supported by the floor of the car and is located adjacent to the motors. An auxiliary motor 5 is coupled to a centrifugalblower 6 which iszprovided with an air intake passage 7, the details of. whichv will be herein after described. The blower 6 is further provided with discharge passages 8 It is to be understood'thatthe transformer 4 and theinotors 2 may be ventilated in series and that. the auxiliary passage 11 may as wellbe connected at. any point in the system, my] object being to insure that heated. air, at somewhat above atmospheric pressure, shall be delivered to the passage .11.

As best shown in Fig, 3,,the intake passage 7 comprises a duct 12,, the intake end of which is located ata point near the edgeof the car fioor, and, preferably, considerably above the driving wheels 3, The duct 12 has a downwardly extending and gradually constricted portion 13 thatterminatcs,at it lowest point, in an orificel i. The passage 7 expands upwardly from the orifice 14 and then extends downwardly to 1 the point where it is connectedto the intake opening-of the blower casing 15. The auxiliary passage 11 is secured tothe intake passage 7 and is provided with a discharge opening 16 thatis alongside, and merges with: the orifice .14.

Having, described, the various .parts enter;

passes into the; constricted portion 13.; The

suction of the blower and the form of the passage 7 then cause the air to take a reverse turn above the orifice 14:, but it will be readily understood that any particles having a specific gravity greater than that of the air will have a tendency to be expelled through the orifice 14: because of their inertia and of the centrifugal action of the air current as it makes the reverse turn. The'above-described separation of foreign matter from the air is eifective under most conditions of operation, but it is possible that, under certain atmospheric conditions and with the blower operating at full speed, there may be a tendency for air to be drawn into the passage through the orifice 14. The possibility of such a condition, however, is entirely avoided by the discharge of heated air, under pressure, through the auxiliary passage 11 and its discharge opening 16, the arrangement acting as an ejector to always insure that a certain amount of air, together with the foreign matter, shall be discharged through the orifice 14. The discharge of heated air through the auxiliary passage 11 performs another function in preventing the formation of ice in the orifice 1d whenever a large amount of snow enters the duct 12. The presence of the snow would otherwise tend to entirely or partially close the intake passage 7 and render the ventilating system ineffective. As previously pointed out, the intake of the auxiliary passage 11 may be located-at any point in the ventilating system and its position may be altered in accordance with variations in atmospheric conditions. For example, heated air, at substantially atmospheric pressure, may be used during cold weather, while air at substantially outside temperature but at a pressure considerably above that of the atmosphere may be used during warm weather.

While I have shown my invention in a simple and preferred form and as applied to an auxiliary blower, it is not so limited but may be as readily applied to self-ventilated machines and is susceptible of various modifications within the scope of the appended claims.

I claim as my invention:

1. In a cooling system, the combination with a blower provided with an air intake passage, and a discharge passage, of means for continuously utilizing a portion of the air discharged by said blower to remove for eign matter from said intake passage.

2. In a cooling system, the combination with a blower provided with an air intake passage, and atdischarge passage, of an ejector means located in said intake passage and continuously operated by a portion of the air discharged from said blower for removing foreign matter from the air delivered to said blower.

3. In a cooling system, the combination with a blower provided with an air intake passage and a discharge passage, of means for continuously utilizing the difference in pressure existing between the respective pas= sages to remove foreign matter from the air delivered to said blower.

4. In a cooling system, the combination with a blower provided with an air intake passage and a discharge passage, of an air passageway between said passages so arranged that the passageof air therethrough serves to eject foreign matter from the air delivered to said blower.

5. In a systemof ventilation, the combination with a blower provided with an intake passage and a discharge passage adapted to deliver cooling air to heat-generating apparatus, of means for utilizing a portion of the air delivered to said apparatus to prevent the formation of ice in the said intake passage.

6. In a cooling system, the combination with a blower provided with an intake passage and a discharge passage, and means whereby a portion of the air from said intake passage and a portion from said discharge passage are utilized to remove foreign matter from the air of said intake passa e.

I. In a heat producing device, a cooling system consisting of a blower, an air intake passage and a discharge passage, and means whereby a portionof the heated air from said discharge passage is brought into engagement with said intake passage'to prevent the formation of ice therein.

8. In a heat generating apparatus, a cooling system consisting of a blower, an air intake passage-provided with an orifice, and a discharge passage, and means whereby a portion of the heated air in said discharge passage is utilized to heat said intake passage and to remove foreign matter from the air in the intake passage through said orifice.

In testimony whereof, I have hereunto sub scribed my name this 28th day of Feb. 191 1 I GEORGE M. EATON. 

